In a class of 27 students, 16 liked video games and 20 liked cartoons. If 12 students like both video games and cartoons, how many students do not like either

27 total students ...

if 12 students like both, that means (16 - 12) = 4 students like only video games and (20 - 12) = 8 students like only cartoons.

27 - (4 + 8 + 12) = 27 - 24 = 3 ... 3 students do not like either